BIND 10 #927: pydnspp Message.to_wire() needs to catch more exceptions

[BIND 10 Development]

#927: pydnspp Message.to_wire() needs to catch more exceptions
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |  jinmei
            Priority:  major         |                       Status:  new
           Component:  DNSPacket     |                    Milestone:  New
  API                                |  Tasks
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  High
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 For example, it fails to catch exceptions from InputBuffer, e.g. due to
 short data (with a long value for some length field).  It also needs to
 have catch-all catch (catch(...) {}).

 Without this our python program could strangely crash from a remote packet
 (so I specified 'high' for severity).

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Ticket URL: <http://bind10.isc.org/ticket/927>
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